Strong Heteroatomic Bond-Induced Confined Restructuring on Ir-Mn Intermetallics Enable Robust PEM Water Electrolyzers.

• Tác giả: Honggang Liao, Hongfang Liu, Tao Shen, Yan Shi, Yue Sun, Chundong Wang, Deli Wang, Gongwei Wang, Guangzhe Wang, Shuang Wang, Ying Wang, Li Xiao, Changfeng Yan, Lin Zhuang
• Ngôn ngữ: eng
• Ký hiệu phân loại: 291.1785 Religious mythology, general classes of religion, interreligious relations and attitudes, social theology
• Thông tin xuất bản: Germany : Angewandte Chemie (International ed. in English) , 2025
• Bộ sưu tập: NCBI
• ID: 176248

Tóm tắt

Low-iridium acid-stabilized electrocatalysts for efficient oxygen evolution reaction (OER) are crucial for the market deployment of proton exchange membrane (PEM) water electrolysis. Manipulating the in situ reconstruction of Ir-based catalysts with favorable kinetics is highly desirable but remains elusive. Herein, we propose an atomic ordering strategy to modulate the dynamic surface restructuring of catalysts to break the activity/stability trade-off. Under working conditions, the strong heteroatom-bonded structure triggers rational surface-confined reconstruction to form self-stabilizing amorphous (oxy)hydroxides on the model Ir-Mn intermetallic (IMC). Combined in situ/ex situ characterizations and theoretical analysis demonstrate that the induced strong covalent Ir-O-Mn units in the catalytic layer weaken the formation barrier of OOH* and promote the preferential dynamic replenishment/conversion pathway of H